not all chateaus are the same, the 5g modem in the device is actually a 'mini' pcie card, the distributor would of chosen the best card for their region then brought that version of the chateau 5g
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If you take a look at the chateaus product page
https://mikrotik.com/product/chateau_5g under the support and download tab there is a pdf with all the different modems and what frequencies they support, I would suggest logging into the chateau and checking what model of 5g modem, checking on the pdf to see what frequencies they support then checking to see what is supported in your area.
In Australia the regulatory body for wireless communications (acma) has a google maps style site here that you can look up a location and find out all the details from the cell towers, I would assume there would be government resources like that for you as well
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