Two things.
The only slot strategy that I ever heard is that some slots are set for higher payback where there is a greater chance of guest traffic hearing a win. With there no longer being many coin machines, I don't know if this still applies? This would mean play machines near main traffic aisles or if near check in if applicable or near a buffet line.
I actually had a friend who played on Kenny Uston's blackjack teams. I was with him one time where the casino advertised the loosest slots and the payback percentage. Now I'm sure if someone advertises that they have a certain percentage payback, that at least one machine in the casino must have it, in order to stay in good graces with the Nevada Gaming Board. He asked the slot attendant if she knew where that machine or machines were. The slot attendant said she didn't know. I wonder if a casino must disclose to you where that slot machine or machines are, by Nevada law?