I was planning on adding an inline filter prior to the electric fuel pump and even purchased a nicely made quality filter with a replaceable stainless mesh filter element ... but could not figure out a good place to mount the filter so it would be both easily serviceable and also out of the way of moving controls ... so put the idea on ice and got on with building.
Recently, I saw info on a new product release which is a fuel filter/gascolator with a serviceable filter that looks like it may be promising. It would mount on the belly skin and is designed to be clocked as necessary. There just may be enough room to mount this unit ahead of the electric pump with a little creative plumbing. If there is not enough room in the bay with the stabalator cables, it might just work just aft of the baggage bulkhead and then route the fuel line back up to the pump through the lightening holes.
It has bothered me somewhat that Facet recommends an inline filter prior to the pump, but we have none built into the RV-12 design. Below is a link to the filter/gascolator. At first glance, the unit looks huge ... but if one looks at the actual dimensions for the portion inside the aircraft, it really is not that big.