You can daisy-chain unlimited stage wedges off the same monitor send if your band shares the same mix.
For individual mixes, the number of monitor sends limits your options. Monitor sends are pre-fader, so fader adjustments won't change what performers hear. Check your model's monitor sends to see how many mixes you can create:
ProFX6v3, 6v3+, 10v3, 10v3+, 10 GO: 0 Monitor Sends
ProFX12v3, 12v3+: 1 Monitor Send
ProFX16v3, 22v3, 30v3: 3 Monitor Sends
While ProFX10 mixers include an FX send, you don't want to use it for monitoring. Using a post-fader FX send as a monitor output would mean fader changes could disrupt performers' ability to hear themselves.
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