As the others have said, need more info.  Especially the number of users.   I quite like the MS350-24X.  I think they are a good price point to get a small number of 10Gbe ports. https://meraki.cisco.com/product/switches/stackable-access-switches/ms350-24x/  It has 4 x SFP+ (10Gbe modular ports), and 8 x MGig ports.  The MGig ports support 2.5Gb/s, 5Gb/s and 10G/s.   So if the machines doing CAD had a 2.5Gb/s NIC (cheap) or 10GbaseT NIC added, they could have a high-speed connection between each other (in the same site).  I assume there is some kind of server or NAS.  Ideally, that would connect that via the SFP+ ports. You can also stack the MS350-24Xs to increase port density. ... View more

Well spectrum tech swapped out the bridge modem with a modem/router, disabled SIP ALG and placed modem in Bridge mode and so far so good. I'll give it 24 hours and take my MX back. fingers crossed! ... View more

I would consider using the individual pre-shared key feature. Sooner or later you are likely to run into issues with the current proposed solution of NAT mode DHCP.    The advantage of Ipsk is that you will have a single SSID with a unique password per tenant. This will give them access to there own bubble of devices. Meaning if someone has a wireless printer, apples TV etc they will be able to access them. At the moment  NAT mode DHCP will not allow this.    https://documentation.meraki.com/MR/Encryption_and_Authentication/IPSK_Authentication_Without_RADIUS ... View more