This frame is designed for an octocopter with 2" props. It is 2.5mm thick and for 2S+ builds. If you need a lighter one, consider the 2mm version.

TuneRC Poly F405 2S-4S AIO FC has soldering pads dedicated for M5-M8. Now, anyone can build a toothpick style octocopter by adding a 4-in-1 ESC and four motors with this frame.  Even if your AIO FC (F405 or above) does not have soldering pads dedicated for M5-M8, 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 : φ9, 2mm, M2; φ6.6mm, M1.4  (recommended to use M1.4x4.5mm)
• Thickness : 2.5mm
• Weight : About 17g
• 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 1.5mm is reccomended for protecting it.