Indeed, I've removed cable ties older than myself, still in good flexible condition, if rather more yellow than brand-new ones are. Nylon is terrific stuff: strong, slippery, resistant to heat and solvent, slow to age or crack. I'd call it "space age", but it's been with us much longer than that!
As for mounts, I've seen them at the usual suspects. Could also try turret board, or make your own with some manner of press pins (e.g. from Mill Max).
Heh, more than I even remember, they have boxes and stuff too:
https://www.digikey.com/short/zczfj7Tim