We love Tidycal's scheduling feature, but there are several businesses that need to concentrate part of their services in the same time slot. For example, in the dog grooming service, we have four professionals available to attend to pets at different times, some of which may be scheduled at the same time, and the user can choose which professional they want to attend to their pet.
The same applies to many beauty salons, nail salons, barbershops, etc.
We know that Tidycal is aimed at professionals or self-employed entrepreneurs, but perhaps you could consider this option.
It is worth mentioning that when I consulted the Tidycal chat, they gave me some other options, but none of them are similar to what I have described.
Here is a reference image of something that already exists on the market.