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[Others] How to keep good thermal contact? Electrically isolating a heat sink?

I'm making a motor driver board with 4 x BTS7960B motor drivers. I want to put them quite close together and dissipate the heat through some thermal vias and into a heat sink on the opposite side ...
Ranking Name Answers
1 PCBWay Team 11
2 Jonathan Scher 3
3 Paul Hupman 2
4 Samarth Jiwarajka 1
5 Engineer 1
6 Ibrahim TKR 1