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My wife wanted to have a towel rack in the sauna. No need to say that it should have a sufficiently high WAF ("wife acceptance factor").
For temperatures common in a sauna, up to 90°C, ABS is the material of choice. The STL with suffix _ABS has an additional strong brim, in case you have adhesion problems.
If using counter sunk screws, see the drawing attached! Pressure must build against the stick, not the printed part, or the part will be split by the forces. Put the mounts on the stick leveled, drill through the holes from the flat side, all through the stick. Then turn and drill a wider hole in the stick for the screw head, from the front side, at about half the stick diameter deep.
Flat heads, maybe with washers, may work, but are not tested.