I don't know how much ceiling or wall tilt you need but likely not enough to be noticeable.

Yeah, I want to hear your outdoor speakers all the way up here! So you need weatherized active LFR1500s then. laugh

It's great your lady will be involved in this and doing labor to boot.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated