On Thu, 17 Jan 2019 23:43:52 +0000, T i m wrote:

I'm more inclined to say that if the projector can get knocked
over
or off then one needs to sort that out.

I think it's more like (we have since learned that) it's being 'pulled
over' because of the data connection (not the power), not being
knocked over directly.

That's what longer cables are for.

I think the OP suggested 'everything' has to be transported there and
away each time but there may be somewhere a sandbag could be stored
on-site (it's not a fire risk or likely to get stolen). ;-)

Anything left on it's own will grow legs.

--
Cheers
Dave.