Hmmm. I was expecting a dental problem for some reason.
Should be OK if left upright after transport for 12 hours before switch on, I believe. I have done this in the past but there may be something different with the newer stuff.
I don't like signatures, they take up too much screen space.
As Above, we used to tip them upside down and take them in the van for a trip around the estate, sometimes it got them working sometimes it didn't but never any ill effects