Thanks for the additional info. In applications with large number of sensors and servos, a significant challenge is to arrange the common ground and supply voltage for those 3 wire connections. A normal breadboard is not very good on that due to extra cap between signal and common lines, extra caps in the common lines, and different order in common lines between left and right side. At the same time, it is the best available common solution.
For Arduino Uno and Mega, there are shields addressing these issues. For my Mega appliucations I have been using this shieldhttps://www.aliexpress.com/item/Sensor-Shield-for-Arduino-Mega-2560-with-SD-card-logger-Assembled/32530910099.html
I did pay under $3 for them, but the prices have been going up. In my case, I did add an IMU unit and voltage regulator for 2x26650 batteries (7.4V) as shown in this picturehttps://4.bp.blogspot.com/-FN8vAznI1vM/V4LYE5KZNLI/AAAAAAAACoU/vLkpwPy5s1g-egSG1t7L-nayZ3S9aJXbACLcB/s1600/MegaSensorShield.jpg
Now, I would like to see similar solution for small STM32 boards. For a general solution, there could be two simplified versions connected to both sides of the boards. First, it would just connect the board pin for I/O and next to that there would be connections for power and ground. In the second version, it will take the two board pins and connect them to 6 pins on the distribution board for the 2 signals, 2 powers, and 2 grounds. If these are female connectors, then it would be like a mini breadboard.
If you will do just one version, it should be for 2x20 connection with two columns of 3 wire connections. With a proper design, there could be a similar solution for Raspberry PI boards.
Another starting point could be a mounting for the Blue Pill boards with one column of 3 wire connections on both sides of the board.
If you can deliver those, I would be interested to use them