Max Pool Members?

As such there is no limitation of adding member in pool. you can add as much you can.

The default value of 0 specifies that there is no limit on the number of connections allowed per second. The optimal value to specify for a pool member is between 300 and 5000 connections.

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mcdvoice login

I think below command can be used

sys license detail | grep ltm_lb_pool_member_limit