My old Vizio tv does not do automatic hdmi switch. It takes me 10 seconds to switch from satellite to roku or Amazon stick! The tv has 2 hdmi inputs in the back, where it is impossible to reach. Joey and Bluray/DVD players (I use 2 devices with a splitter) hdmi cables are connected back there. And 2 more hdmi inputs on left side of the tv. One of those inputs has Amazon stick. The last hdmi input is used for Roku stick and laptop with splitter. Why laptop? I have tons of mp4 and VOB movie files in external hard drives. When I am in the mood for a movie, I just change the video input with tv remote. Seconds. Neither splitter has its own power cord. I have never had any issues.
I agree with Bobby regarding hdmi cables. Monoprice is one of the best places for cables, even better than Amazon.