I quickly learned that the second part of the proposition just isn’t true as sub placement is very critical but I just use one sub in all my systems.
For sure you are right.
What is called room nodes is a pressure distribution zones grid...
When i used resonators in a room location matter as the main factor as much as the mechanical tuning ...
i dont know about many subs...Or one...😊
My 2 rooms were around 1000 feet square and with my resonators i dont needed one even if for sure it would had improve the sound quality ...