Where do I put the heatsink on the BTT SB2209 USB board?

[m00ch]

Good Morning, I do understand this isn't exactly a wiring question but related. Could someone help me to place the included heatsink in the correct place on the SB2209 USB board. There seems to be 3 spots that would make sense and I assume it is the red circled area but you know how assuming goes. This is the USB board which may make a difference because when I see the CAN board it shows the heatsink installed. Thanks for your time.

Edited February 16 by m00ch

[jellyfish]

Probably best to put it on the TMC 2209 directly (has a triangle logo on it and it says Germany on it) however it interferes when mounting so i put it directly on the cooling pad of the TMC 2209 on the other side (gold plated with many holes). Should be the red circle in the picture, however mine looks a bit different. Make sure not to short out any pins with the Heatsink.

Edit: Yes it's the red zone it says actually in the manual (I'm currently building my own first kit so I just saw it): (https://github.com/bigtreetech/EBB/blob/master/EBB SB2209 CAN (RP2040)/Build Guide/EBB SB2209 CAN V1.0（RP2040）Build Guide_20240626.pdf)

Edited February 16 by jellyfish