Different if no lid !
I would use some double sided foam tape (normally cheap 3m type Chinese copy is good.)
I put small pads on each corner to mount on HS and thicker, small tripple layer pads on top at each corner - do not remove top backing layer so they don't stick to the lid.
Then gently screw on the lid to leave an air gap above the fan and round the edge of the lid.
If you can't screw on the lid try with small pieces of tape at each corner to leave the air gap.
See what temps are like in this set-up ...
Pete
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