In most cases if you have Comcast, your best option for a DIA is Comcast Business. Which again, is drastically better than Comcast's residential service... but it's still Comcast.
Such as over-subscription and having to contact the BBB to finally get a non-"Let me look at my book, ah yes! it's your modem" response. I finally was contacted by the Technical Operations Manager to affirm "Yes [name] is correct, bandwidth demand exceeds the capacity of the system in their area. We are working on a permanent solution to allocate more bandwidth"
That was 9 years ago, and I'm back again. I pay for the catchy "UP TO" 35 MBit/s upstream and can barely hold 2 MBit/s during peak and about ~25 outside peak.
Between fighting for bandwidth amidst everyone else going to the same base station, random assigned IP addresses that occasionally end up with accusations of pirating you had no partaking in, and storms messing with your signal quality, I would heavily advocate against any reliance on it for business related operations.
Starlink also does not offer static IP addresses.
They do, albeit I don't know the exact details as to pricing and everything. My company uses Starlink as a backup WAN connection at one of our sites, and it has a static IP.
> Although truly static IPs are not available, a reservation system retains the public IPv4 address and IPv6 prefix even when the system is off or rebooted.
You have a potentially stable address, but not a truly static one.
https://blog.apnic.net/2024/05/17/a-transport-protocols-view...
At work we deal with the sort of folks in this blog, where adding a link between a couple sites requires four or five months, multiple teams boring new fiber runs, etc.