A:AnswerI got this from an answer above from insignia
For the Insignia™ 55" Class F50 Series LED 4K UHD Smart Fire TV, the standard VESA mount pattern is 300mm x 200mm, and it uses M6 screws, typically 16mm to 20mm in length depending on the thickness of your mounting bracket.
A:AnswerNo unless you have a Chromecast device (or another compatible streaming device) plugged into your Insignia TV that can then connect to the google home allowing it to control the tv or you can plug an HDMI cord in and control it via that way
A:AnswerI also ended up setting this up as a continuous looped feed. Get to the videos/images you want to show and never turn off, go to options and put as continuous replay of all. There is no option to put tv into "never" timeout (shutdown) in regular settings.