If you are talking a /22 only for just your wireless users then no need to split it up. Meraki enterprise equipment will be able to handle a /22 without issue. Splitting it up will likely mean even more airtime for the added wireless overhead. If you are sharing the same /22 with your wired clients then, yes, split the wireless from the wired and let your L3 device and firewall decide who talks to what. monitor what your actually using IP wise and reduce lease times if needed. IMO If wired and wireless you need at least 4 vlans: one for management traffic one for wired employee business use (laptops pcs etc) one for wireless employee business use one for guest/visitor wireless use. Ultimately, it depends...How simple or complicated do you want to make it? IMO, you can rest assured a /22 isn't crippling like it was 20 years ago for wireless or wired, especially so with true enterprise class equipment.
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