Home water filtration system install under the counter, will this clearance work?

Need a sanity check on cabinet clearance before this install gets scheduled. Unit’s an under-counter ionizer (Tyent built-in).

Galley kitchen, single bowl, copper supply, disposal on the left. Cabinet 22 wide, 21 deep, 27 inches under the back wall. Cold supply has a quarter-turn ball valve from last year. No filtered faucet on the deck so granite drilling is happening.

Main thing I’m stuck on is the GFCI inside the cabinet. Cell unit needs power and there’s no outlet down there. Plumber I usually use is handling supply and drain, electrician is a separate visit.

Anyone done under-counter ionizer or RO+ionizer setups? Photos of the cabinet available.