Power Distribution - to separate source components from amplification?

Sometimes. I do recommend a dual zone approach. One zone for your purely audio devices and another for networking/streaming. The main issue is really the power supply polluting an already cleaned up AC. Ethernet/router wall warts tend to be terribly noisy to putting them in their own zone is a good thing. I recommend a Furman PST-8 as a low cost, high value option. Best in class surge suppression plus excellent linear noise filtering. Also good for your TV, etc. If you buy a Furman make sure to get a unit with SMP/LiFT at the very least.

Every component in my system is plugged into the PSM156. I've tried amps into the wall or other devices and heard no advantage. Work for me anyways. Quiet power cables help quite a bit. I presently switched to SR power cables and found them to be the quietest I have ever used. Clarity and bass improved as well. YMMV

Ideally two direct lines, with all components plugged into the Puritan execept the amp. The amp plugged into the other direct line. Power amp should be plugged directly into the wall.

I’ve tried a couple of power conditioners made just for amps and they definitely got in the way and limited the amps dynamics.