2 Internet Connections with GS110TPV3

Hello,

I have 2 internet connections and I would like to setup for failover and hoping someone can help me out. I have 2 RJ45 SFP modules plugged in to the 2 SFP ports as well. I can use these for incoming internet connections, right?

I have 1 line with a 10.5.1.254 gateway, and another with a 192.168.1.90. I would like 10.5.1.254 be the primary gateway, and failover to the 192.168.1.90 when it goes down. I have an 8-port unmanaged switch connected to the GS110TPv3 switch, which contains 2 clients. 1 client is DHCP and another is static with 10.5.1.215. I would like when the failover occurs, that the DHCP client (which will now have a 192.168.1.X IP) to be able to still communicate to the 10.5.1.215 client via Layer 3. The 10.5.1.215 client does not need internet access when the failover occurs, it's just a local printer. Can someone help me achieve this or point me to a similar post?It seems like whenever I start playing with VLANs I lose my connection. Thanks for any help!