TLDR; a simple and easy to print Fire TV remote holder that mounts to your TV with double-sided tape.

Confirmed fit for Insignia NS-24F201NA23, 24in Fire TV, but will fit any TV with flat spot measuring at least 38mm wide and 52mm tall

For the more verbosely inclined; I added a ceiling mounted 24" Insignia Fire TV to my small printer area and wanted a remote holder that mounted on the TV. The small area keeps me within a few feet of the TV, so keeping the remote on the TV made sense.

There's an angled, flat spot on the rear, lower side of the TV that's perfect to place the remote mostly out of the way, but easy to reach when needed. The holder can be stuck there with some double-sided tape and you're done. I recently discovered my wife's fabric double-sided tape (for use on fabric, not made of fabric) and it's cheap, super thin and holds surprisingly well. It actually sticks well to PLA too.

With some scaling I'm sure this holder would work  for Roku and various other remotes, but I haven't messed with that yet,