Will preamp manufacturers tell you if the model is phase inverse?

Ah, yes!  Good point.

Virtually certain that the RP-1 inverts phase--confirm with John Rutan (audioconnection on this board).  I think the added complication with that preamp is that the phono pre-amp adds another stage of inversion, bringing you back into phase.  If you care about that sort of thing (I do, others don't), it means you're switching speaker wires around when you play records....

Looks like a lot of maintenance to play records. One would think they would at least include a switch. I have heard that some amps do include a phase switch. Not certain for the phono section. I'll reach out to Rogue and get back

I just heard back from Nick at Rogue. The RP-1 and the RP-5 Both invert phase on ALL inputs (including phono). So I would need to switch speaker terminals when using. I wonder how many owners are not switching the terminals

John Atkinson always mention absolute/inverted polarity with his Measurements :
Rogue Rp-1 phono stage preserved absolute polarity and line inputs inverted absolute polarity
https://www.stereophile.com/content/rogue-audio-rp-1-preamplifier-measurements

FWIW, generally speaking, I've noted that most tubed preamps with only one tube per channel invert phase.