Which 4G modem to choose for the office?

Question

mobile connection

In the office, from a regular phone, a connection of 20-60 megabits shows that the channel looks relatively good.
4k video from the phone pulls without problems, we will assume that the conditions are relatively good.
The budget for the device is 3-8k, if more then you need to motivate why.
Magarers will sit, at best, this is IP telephony and orders on the site.
There is no window in the room, measurements were taken indoors. (from the side of the windows, the connection is worse than 20 gives no more)
This is a warehouse. It is desirable to connect the GR45 output or USB to the Keenetic Wi-Fi router.
Actually, which device is better to take, which antennas, in general, tell me.

PS
Pliz only those who really know what to choose.

Answer 1

So if the phone catches the norm, a usb modem is enough, I would take an iota .. because there is an unlimited ... remove the modem from the wifi by at least 30-50cm
Or a ready-made router is the same iota, since you are not a demanding user (this comes from the kinetics )