Jacking up the spyder

[Spindoctor]

The time has come to replace the tyres. I've got a new set of P Zeros and I want to get a mobile service to come and fit them. The rear can be jacked on the cross member so that seems easy enough. But should you jack both fronts on the spyder at the same time or will it be ok with one side at a time? I'd quite like to avoid stress damage to the windscreen etc...

Any advice much appreciated.