Something like the below.
https://www.westfieldfasteners.co.uk/Bolts-Screws-Metric/5-Lobe-Pin-Button-Security-Screw-M5x12-A4-Stainless.html?google_shopping=qty_A4_ScrewBolt_Pin5LobeBtn_M5_12=2&gclid=EAIaIQobChMImInX6M6GgQMV0NLtCh3izgTHEAQYCiABEgJK1fD_BwE
I have a new insta360 one RS camera and wondered if anyone else has been using one while on their bike and what recommendations they would have on mounting and modes that give best results.