Passive cooling ESC location

What is the best location for the ESC - Go-FOC HI300/HV200 75V/100V with passive cooling?
Does anyone have a board design for about 130 liters?

Either build an aluminium plate into the bottom of the board and attach the mast to it or just laminate an aluminium heat sink into the bottom. Works well for me, see here: Daniels (un)geared inflatable (slowly built) - #72 by sat_be

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