Hifonics Thor Powered Bluetooth ATV UTV 10-Speaker Sound Bar w/Amp TPS10

How can I connect this soundbar to my boat's sound system? I want to use my current speakers with it.

I have a 2019 Polaris rzr 1000 xox and I can’t seem to mount it to the roll cage behind the seats any suggestions?

how many

Will this work with only my phone? No receiver as long as it has 12v power