[CA] Installing an Axiom MFD

[Jack46]

I’m in the process of installing a major update on my Boston Whaler Montauk 190-2011 electronics equipped with Mercury EFI Fourstroke 150-2015 adding a 2nd engine for safety and trolling purposes (Mercury 9.9 Fourstroke long shaft).
I plan to replace my electronics dismissing the old Raymarine A7d and acquiring a new Axiom 9” (I mean the standard model, not the PRO).
The Axiom will sport the complete fishfinder set (3d, sidevision and downvision) with an RV100 transom mount transducer and, very probably, an EV100 autopilot too.
As it is a major a very costly update, I want to make sure of everything before throwing a lot of money into the boat.
I have now a couple of questions:

Is there any better alternative to RV100 transducer taking into account that I cannot install a thru hull transducer and I can only install a transom mount transducer?

Is it possible to display on the Axiom screen the Mercury (main engine) data?
Should I buy some adapter or converter?

Thank you for your help.