Assuming that the FUMO needed is the modem and not device, check out this link;
As far as PRL goes, most IP-based carrier networks (4G and up) do not require the PRL update to initiate from the UE but rather send out on a periodic basis, as needed. IMO, roaming agreements do not change often enough to make this a required routine process. Not like the old days anyhow. That said, each time the device registers on the network, and communicated with it’s EPC HSS, it is “updated.”
I will say that the advantage goes to Peplink for Advanced Band Selection (not an option in Cradlepoint) which may help to find that “sweet spot” BAND.
For the Community, here is a link to what lenl is referencing on Cradlepoint;
https://customer.cradlepoint.com/s/article/NCOS-How-to-perform-a-FUMO-or-PRL-updates-on-supported-modems