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Open bonnet, shake engine backwards and forwards.. that'll give you a good idea at which mount is gone
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Is it advisable to change the lot at the same time or not?
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Hard to say exactly which. Highly unlikely to be the gearbox one (but dont rule it out).
If it clonks when you pull away that kinda says top mount (and not just the mount probably need the metal underneath welded) but the heavy vibrating on idle could be the lower mount.
Id probably do the top first and see if it cures things and if not then do the bottom as you have to take the drive shaft out to do the bottom one.