IMO, over turning will cause the fish to break up... So please fight the temptation of becoming ah over flipper
A few weeks ago I pan grilled a few wild salmon fillets and it was amazing. A lil olive oil in the pan, seasoned fish with green seasoning, salt & black pepper then drop he arse in the pan. Medium to high heat to give it ah nice sear on both sides and I left the middle a little pink. Breds let meh tell uh, that sheit was juicy and flavorful.
Usually when I'm grilling fish outside, I use a lot of cooking spray so it don't stick. I also sear it on med-hi heat then move it off to the side so the inside could finish cooking under indirect heat. A nice long metal spatula will help keep the fish together while yuh ready to turn it
tip: rather than loading up the grill all at once, try 1 piece first so yuh could get a feel for the cook time etc. Once yuh master the first piece, then yuh throw the other peices on the grill and yuh good to go