Can I Mount Camera Sideways

Applies to: Argus; Argus 2; Argus 3; Argus Eco; Argus Pro; Argus PT; Reolink Go; Reolink Go PT; Reolink Keen; B400; B800; D400; D800; RLC-410; RLC-410-5MP; RLC-410S; RLC-411; RLC-411-5MP; RLC-411S; RLC-411S-5MP; RLC-420-5MP; RLC-422-4MP; RLC-422-5MP; RLC-423; RLC-423S; RLC-511; RLC-520; C1; C1 Pro; C2; C2 Pro; E1; E1 Pro; E1 Zoom; Reolink Lumus; RLC-210W; RLC-410W; RLC-410W-5MP; RLC-410WS; RLC-411WS; RLC-411WS-5MP; RLC-422W; RLC-423WS; RLC-511W;RLC-422W-5MP；RLC-522;RLC-510A;RLC-810A

You can mount cameras sideways, but it is suggested that you'd better avoiding mount camera this way, because it may affect your viewing angle. 

Regarding how to mount your camera, please refer to the following article:

How to Mount Reolink Cameras