Kitz would need to provide you with a graph of the FM filter's performance, a photo reveals nothing about the filter's parameters. Sure, I can test it if you'd like. Haven't seen a sample of that model.
I'd just throw a HLSJ (cap the L input with a terminator) on the front end of the pre-amp and be done with it since you don't have any low-VHF to worry about.
FM usually causes problems on high-VHF first, but an amp, in the presence of any strong signal, can go into compression and cause weak signals to be lost. It's simply better to keep the strong signals out of the amplifier in the first place.
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