Help /advice Garmin install on 2022 Tritoon

[Waterlog@65]

Hi,
Tritoon is new for me. I just bought a chartplotter :
ECHOMAP UHD2 74cv with GT20-TM transducer

Any advice on installing? I’m thinking of a small battery under helm for dedicated Pwr source.

Thanks,
David H.
Pensacola Fl