Raspberry Pi 3 with 2 NICs as proxy server

Hello everyone! I have one technical question.
I can get 2 additional dynamic IPs from my ISP. On each modem port one (port 1, port 2), my home network is on port 3 (behind the router) and TV on port 4...
My plan is to buy Raspberry PI and add second NIC (usb) to it so I can run 2 proxies at the same time - connect each NIC directly to modem ports (1 & 2). So I would have 2 residential proxies that rotate IP every 24 hours.
My question is: Is this doable with Squid server and what Dynamic DNS provider supports 2 NICs on same device?

Thank you!

raspberry pi is not suitable for this. the processor is much too slow to take the place of your nice router or security appliance. if you are interested in a diy router, the opensource community for this is very mature.

You can do that.
Just be sure the usb you are pluggin in your rasp are not exatly same model. Because if they are, it is possible that they have same device ID and you will have troubles differentiating them.

I just got APU 1d hardware with 3x NIC. My plan now is to add 4th USB NIC and use this as my main router and USB 4G modem. My ISP will give me 14 more static ips. So it will look like this:
NIC1: LAN
NIC2: WAN - 15 static IPs (modem port 1)
NIC3: WAN - 1 dynamic IP (modem port 2)
USB NIC4: WAN - 1 dynamic IP (modem port 3)
USB 4G modem - 1 dynamic IP

I know how to configure Pfsense (gateway software) and NICs on it, but I don't know if it is possible to configure Squid server to work with all this mixed ips on different NICs. Someone knows if this is possible with Squid server? Thanks!