Where to mount remote FPR

I did a search, but the only thing I could find was about the B&M ones.
To the people that have remote FPRs where did you mount them, I couldn’t find a place.

Also the regulator I have has three barbs, one is for the vacuum(small silver one), one is for the high pressure fuel hose(it’s red), and one is for the low pressure fuel runback hose(it’s blue). Where does the blue one go? Does the blue one just dump out?