What filter is everyone running and where did you mount them? I've heard good things about the T1-https://www.t1racedevelopment.com/ (local to me) filter but haven't seen anyone run it.
Fuel filters are built into the pump assembly and are not a serviceable part, adding a inline filter will just increase your pressure drop and not do much to clean the fuel since the one in the pump assembly is already something like a 10 micron filter. When you do a return style fuel system you will want something that is 10 micron and either micro glass or stainless steel with minimal pressure drop. I'm a big fan of Radium and DeatshWerks filters, both have really low pressure drops, so do the FORE filters