Dear Derek,
Thank you for reaching the Small Business Support Community.
I do not see any problem to accomplish your needs with the RV320, and that VLAN setup looks good specially if you are looking to allow/deny inter VLAN communication among the different sites, another feature that would help is the Firewall>Access Rules, where you can permit/deny access to/from an IP or IP range for the servers in particular. I suggest you using a class C IP private address range since these Small Business devices where intended so.
If the four locations are going to be connecting to each other via IPSec VPN, notice you'll need static public IP addresses on the sites WAN interfaces, or Dynamic DNS.
Just in case and to give you a better idea of the configuration interface, below is a link for a simulator;
https://www.cisco.com/assets/sol/sb/RV320/default.htm
RV320 admin guide;
http://www.cisco.com/en/US/docs/routers/csbr/rv320/administration/guide/en/rv32x_ag_en.pdf
RV320 datasheet so you get to know all of its features and capabilities;
http://www.cisco.com/en/US/prod/collateral/routers/ps10907/ps9923/ps11997/data_sheet_c78-726132_ps9923_Products_Data_Sheet.html
Please do not hesitate to reach me back if there is any further assistance I may help you with.
Kind regards,
Jeffrey Rodriguez S. .:|:.:|:.
Cisco Customer Support Engineer
*Please rate the Post so other will know when an answer has been found.
Jeffrey Rodriguez S. .:|:.:|:.
Cisco Customer Support Engineer
*Please rate the Post so other will know when an answer has been found.