OP/TECH USA 1301322 Adapt-Its - System Connectors

How strong is this thing? Can it hold Canon 1DX + Canon 70-200 2.8 IS II lens? Thanks!

Hello! The strap lugs on my Olympus E-520 are vertical, not horizontal (like shown in the video). Would these still work effectively? Thank you.

I just want to make sure they come in pairs. For three bodies I would order three not six. Is this correct?

Do they fit a Nicond5000?