Inspired by Djngnear's tabletop tray, I remixed mikeev's mount for the Sunlu S2 to entirely remove the screw holes (with no internal bits left over) and cut it down to fit on a Prusa Mini/+ bed. I also cut the power cord hole to be open to the top of the tray, so you can insert/remove the filament dryer without unplugging it. This stabilizer isn't winning any beauty contests, but it works just fine for holding the dryer steady on a flat surface.
As one user was confused, I will clarify that this is not intended to compensate for the weight of the open lid. This is to keep the dryer from tipping when it's in use or being stored, not when you have the lid all the way open as you change the filament roll. You would need a much larger and/or heavier base to compensate for the unbalanced open lid, which is not a problem this model is designed to solve.
Printing notes:
The author remixed this model.
Trimmed to fit a smaller bed (e.g., Mini/+), cut plug hole open to top (so you can insert/remove dryer without unplugging), and fully removed screw holes (including internally)