None on the amp - it should be plugged directly into the wall. Use the existing line filter for the digital source only.
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If an Isoclean falls within your budget, I'd recomend one wholeheratedly. I'm using a 60A3 in my system, and even in a single family dwelling with a dedicated line for the rig it helps. It feeds my Tom Evans or Audion amp, the TEAD Vibe preamp, and Audio Note DAC and transport. I leave the subs plugged straight into the wall, because I haven't heard any benefit from filtering them. Isoclean is pricey, but it's the only one I've heard that didn't bring any sonic compromises to the table.