With this new design you can use screws or just double-sided tape like I do.
The HE will sit 2mm above the base to allow for airflow and will be flush on top.
The fit is almost like a snap on and will hold the weightless device in place very well.
Even with the weight of the cables on the side, it holds up.
I liked it very much. Simple and practical.
I set my CR-10S at 225 degrees HotEnd, Bed at 50 degrees.
Designed it in Fusion 360