I have a user who just want to connect 2-3 Machine as a wired connectivity and 2-3 Devices which include just mobile phone as a wireless connectivity. Just to let you know the user is on NBN Fixed Wireless.
I have both an MX Security Appliance with the Advanced Security licence, and a Z3C.
The Z3C does not have all the options available with the Advanced Security licence. But it is still much better than most small routers. I take the Z3C with me when working away from the office or home, it is excellent and the LTE modem works well. I can plug the Z3C WAN Ethernet port into the RJ45 on those high speed trains with wired capability, otherwise the wireless connectivity is fine.
The MX will not handle those premium TV services that require an IGMP-Proxy on the router.
Whilst either device does the job well, it would be a premium-priced solution, given the need for ongoing licences as well as the original purchase cost. I use them, and other manufacturers' kit, because I am in the business, if I weren't I'd probably save some money and put it towards Netflix subscriptions.
From a sizing perspective Z3 is the right choice, but if you need advanced license feature then MX is the recommended option. Either way I don't see a specific reason why you need Meraki, you may look into other vendors to keep the cost down.