The only Victron products that have more than 1 MPPT tracker are our 48V only RS models.
24V MPPTs can be connected in parallel, but they only have a single tracker per MPPT, so you will need to treat them separately and only use 1 tracker in the MPPT calculator.
The calculator will not recommend multiple MPPTs.
So if you specify 2 MPPT strings are required, then it will only recommend the models that have multiple trackers built in.