According to Tyres.co.uk, current Active and Icon models of Toyota Proace can be fitted with either Michelin Agilis 3 or Goodyear EfficientGrip Cargo 2 in 215/65 R16C. The Proace Design reaches 215/60 R17C, so check the registration, door label load index, and speed rating before purchasing.
Each tyre for the Toyota Proace contains information in the sidewall for the tyre size. For the factory fitment specific to the vehicle, we can look on the tyre pressure label found on the driver-side door. This label has the correct tyre pressures, so it may also have different fitments for load or wheel configurations.
Generally, not all Tyres of a Toyota Proace will need to be replaced, but in cases where two tyres need replacing, safety recommendations state the two new tyres should be installed to the rear axle. As the Proace range (including the Proace Electric) is all front-wheel drive and has no factory four-wheel-drive, there is no requirement to replace all tyres. All models of the Proace range must have the same matching tyres of similar size and construction, load index and speed rating on the front and rear axles.