I treat all these RPi kits as toys, sorry.
Mobile equipment recommendations are typically region specific. If you're in the UK, Italy, Poland and some other countries then probably the best option is to buy second hand ZTE MF286D router and use it in a bridge mode (with OEM software) or flash it with OpenWrt. You can expect something like 150/30 Mb, depending on the local conditions and capabilities of course.
Another popular solution is 4G/LTE modem in M.2/NGFF form factor installed into external enclosure with USB, extra power and antenna connectors.
As a next step you could use 5G/NR modem in the enclosure with Ethernet interface.
Here I tried to list some questions that needs to be answered and also provided a couple of examples.