Qobuz has this feature. HDTracks, although not a streaming service, has HD titles for purchase.

I see a couple of issues. You are limiting sub placement, which can be critical. You are limited to subs that fit in the enclosure. And the neoprene mat can only do so much to isolate vibrations.

Not all speakers will sound better toed-in.

It’s probably fine. If it’s an older P3 with the old style motor, however, the motor upgrade is well worth it.