This frame is designed for a tiny octocopter with 40mm props. It is 1.5mm thick and for 1S builds.

Recently, we have 1-2S AIO FCs with F405 MCU by JHEMCU and Flywoo. These AIO FCs do not have soldering pads dedicated for M5-M8. However, they have sufficient UARTs, so it is not difficult to control 8 motors by making resource remapping unused UARTS,  LED_STRIP or SCL (I2C) to M5-M8 and make those pins enable timer and DMA (for DShot).

• FC and ESC Mount : 16x16mm, 20x20mm, 25.5x25.5mm, M2
• Motor Mount : φ6.6mm, M1.4
• Thickness : 1.5mm
• Weight : About 6g
• Compatible with the whoop-style USB connector

If you want to mout an additioinal 4-in-1 ESC under this plate, the Minimal Bottom Plate 1mm is reccomended for protecting it.

My build using a prototype frame is submitted to Rotorbuilds as "1S Tiny Octocopter". 

https://rotorbuilds.com/build/30046