Rel subwoofer high level connections with McIntosh integrated amp

yes

straightforward - just use same taps

Doesn't matter which taps are used. No reason to add another connection to the ones used for speakers. Doesn't matter, because all these high level input circuits use a resistor, typically 20k Ohms to 50k Ohms. That is why it doesn't "suck any power". Its also why it doesn't matter which taps you use.

Great thanks. I wasn’t clear on the speaker connections. Didn’t want to short anything.  Again thx