I recently installed an aftermarket fuel filter head with CAT-1R0750 filter in the 2015 Golf. Years ago I did the same in the 05 Jetta and that has worked out well.
The kit for 2015 Golf
https://nicktane.com/product/uber-fuel-filter-kit-passat-2010/
This install was not quite as straightforward as it was on the older car, I also deviated from the intended methods. I may have also been shipped some incorrect parts, or my car was not quite what they had in mind for the particular kit, I'm not sure. The vendor was helpful in sorting out the issues I asked about; I took care of some on my own.
The original fuel filter has 3 lines, all 10mm. Originally I was sent some 10mm and some 8mm banjo barb adapters for the new fuel filter head then I swapped them out for all 10mm to match original filter fittings/hoses.
The supplied welded together bracket I couldn't figure out how it worked/fit in the 2015. Which is OK because the original fuel filter cannister and bracket after some trimming makes a superb bracket to mount the aftermarket filter with the supplied large hose clamps. Left 3/4" of the cannister above and below the bracket, trimmed the sides closer to the bracket. Some rivets are in the way so added 1/8" cork gasket material attached to the bracket with contact adhesive.
Trimmed bracket
Corners rounded and cork added to clear rivets
The kit was supplied with one long and one short banjo bolt so the supply (from tank) and return line could be stacked on the same port.
I chose to purchase two more short banjo bolts (not use the long one) and modify the filter head to include a third port then all three lines would fit side by side in the same order like the original setup, a very clean install. Thread size was M12x1.5 and must be tapped dead square to the surface or you'll have leaks. Milled some clearance in the filter head for the new hose.
Also check the banjo bolts for burrs inside, it would be smart to deburr them, at least the one feeding the injection pump, to avoid passing metal into expensive components. All of mine had burs inside from the cross drilled holes.
Modified filter head
Only issue I had with connections was the hose from tank to filter was 1/2" short in my application. The original hose, though molded/formed, is more or less straight so I thought easy to replace with a new hose... except the hose barb on the quick disconnect fitting near the firewall is 8mm and the other end at the filter is 10mm.... If only I had kept one of those 8mm banjo barb fittings I could have used an entirely new piece of 8mm hose, and I would recommend that for anyone duplicating my attempts. Instead I cut the stock hose about in half and spliced in a new piece of 8mm hose with a barbed splice fitting. (hard to add only 1/2" length to a hose thus cutting the original hose and adding several inches of new hose)
8mm diesel hose I used
https://www.idparts.com/diesel-fuel-hose-8mm-meter-n2035915-16121180409-p-3077.html
Short hose
Splice in 8mm hose
Summary:
The new filter using the original filter cannister/bracket looks good and fits perfect.
Still not sure about the bracket that comes with filter kit, didn't seem to fit.
Double check hose size and new barbed fitting size.
Expect to replace or lengthen the hose from the tank to filter in any case, probably use 8mm hose.
For a more professional look/fit add a third port to the filter head.
Use VCDS to prime the fuel system for minimum 3 minutes before starting the engine.
Finished
two hoses on the center of the filter is not what I suggested. 
