I like to have mine as close to hand as possible, I’ve a Ridgeline bino harness which I like as either side there are Molle straps… on the right hand side of my chest I have my thermal - located in a ‘bottle holder’, the base of the holder has a circular piece of foam to prevent it ‘squashing’ and to make sure the thermal ( hik lynx pro ) doesn’t drop down too far….the other side is a walkie- talkie pouch for when I’m using one ( I think there’s a petzl head torch tucked in there at the moment…. Secured in a similar way- I don’t like too many heavy things around my neck.
I used the thermals camera mounting thread to secure it, you can buy threaded loops from ebay, this goes to a clip which is interchangeable with a neoprene camera harness ( for nighttime foxing) and on the bino harness has enough travel to go up to my eye, without being too restricted, if I ‘drop it’ if falls to above belt level - softly cushioned by my beer belly…
I find with my rifle over my right shoulder, holding sticks in my left I can spot with the thermal using my right hand and pick it up and pop I’d back so easily into the bottle holder- it doesn’t get wet/ banged/ dropped/ muddy…. If I see a deer I can just drop it - pick up the binos to see if it’s one I want, then move to sticks without it getting in the way…