Warning!!!
We do not recommend this, but if you are persistent, try it at your own cost.
For the mirror booth, this is possible by carefully drilling the top of the booth with a size of 3/8” and using a knot to secure it, The knot size is "3/8- 16x3 hex tap bolt with a 3/18-16 wing nut" (please check photos below).
For other booths, Most of our booths have a hole already on the top. To add a flash, all that needs to be done is to secure the flash with the same knot.