I have 10MU of Dotcom-format modules in my side cabinet that consist of a Moon Modular M569 Quad Sequential Voltage Source and a Synthesizers.com Q109 Envelope Generator, and a Q115 Reverb. Since this photo was taken I have also added a custom M569 Companion module.
My M569 Companion module provides a Moog-like start and stop function, external clock, brings out some of the M569 control signals to jacks, and has disable switches for transpose for rows 3 and 4. More details are on my M569 Companion module page.
I mounted the Q115 reverb tank vertically on the cabinet side to minimize the coupling from the nearby power transformer. This orientation significantly minimized hum.
I use a MOTM-990 power distribution board and build MOTM-to-Dotcom power cable. Both the M569 and Q115 are +/- 15 volt modules that use the 4 pin MOTM connector. The Q109 uses the 6 pin MOTM connector for the additional +5 volts.