A number of fellow audiophiles who own PS Audio regenerators have independently come to the conclusion that they are NOT suitable for power amps causing them to be less dynamic, more constricted. Even the friend who has a P15 which is adequately rated does not use it to power his amps. Both he and I run PASS XA-60.8 monoblocks. We use the P's for front end components only. If you need extra outlets I would suggest a power extender strip without surge suppression such a this one from Tripplite...
https://www.amazon.com/gp/product/B00005115S/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
https://www.amazon.com/gp/product/B00005115S/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1