I searched high and low for a mount/base/holder for my 240ml Acetone and Alcohol bottles for cleaning the print bed and found nothing, so I designed my own and figured there's a few others that could use it as well.
It holds two standard 240 ml bottles available at Hobby Lobby, Wal-Mart, etc. My bottles measured 51.35mm in diameter and I increased the bore size to 53mm for some wiggle room and to allow for a bit of variation between different brands of bottles.
This will slide right into the top frame rail above the posts on Ender 3 and Ender 3 Pro printers. Will probably fit others as well if they use the same frame rail notching.