Hello Cleveland! Thanks in advance. So, here's the story. Customer put in a tub and didn't put the faucet assembly in before it was tiled. Stupid! So, I get the job of cutting the hole in ceramic tile for moen U232CIS rough in - transfer valve which is not round or rectangular. The spout hole will be fairly easy. The backside is a closet that the sheetrock is removed and existing water lines capped off at least. I bought a 4" grinder wheel for ceramic and porcelain for the 2 straighter side cuts, and have 2 diamond edged 1-1/4" hole saws for the round edges. But will have to carve out areas that the hole saw and grinder wheel can't get at. I doubt a toto zip bit would work? IDK? Any thoughts for cutting out a hole in the tiles? I think the tiles are 4" squares. The moen UT3322 trim kit has an outer plate that goes over the valve & hole, and only about a quarter inch of leeway around perimeter for seal. Then the finish escutcheon plate goes over that. Thank you!

you could drill a series of 1/4 inch holes close to eachother and carefully chip out the pieces.

I use a Dremel with a small diameter diamond wheel or diamond burr, a 4 1/2" grinder or buy a hole saw as needed. For under $20, you can buy a 2 1/2" or 3" diamond hole saw.

Hopefuly the tile is ceramic and not porcelain. Porcelain is much harder to work with.

Another vote for Dremel and a glass or tile bit. This will require patience.