I've been pondering an idea and wondering whether anybody has tried this before.
ISPs in my part of the world will give you an Ethernet handoff, and it will go to a classical router (name your brand here), which is an additional hassle to manage, since it is not cloud-enabled. The ISP also provides a /30 WAN block of IPs, say 18.104.22.168/30, .1 will be their ISP provider edge (PE) router, and .2 will be your customer edge (CE) router. You will also then receive your /29 "LAN" block of IPs, say 100.100.100.0/29, to use for your devices.
Our situation is that a warm spare group of Meraki MX require unique public static IP addresses, so I need that router, and the /30 and /29 blocks of IP addresses, vs using one single IP for both.
I want to eliminate the classic router and replace it with say, a MS225-24 since it is basically only ever doing static routing from Gig0 to Gig1, no NAT, no DHCP, no nothing - that intelligence is handled by the MX. The MS225-24 offers baseline Layer 3 routing with 16 static routes - when all I really need is one route (default) and two directly connected interfaces.
As a plus, I would kill two birds with one stone - I would eliminate an unmanaged Layer 2 switch and the ISP router and consolidate both into one device.