Remember that you also need to add many mains-powered Thread devices (which works as routers/repeaters) to the same Thead network as well or else you will not get good range or coverange, because Thread are low-power radios which commication uses short messages over 2.4GHz frequqncy range which means that have very poor wall penetration (similar to Zigbee).
Highly recommend following the same best practice tips for Thread as for Zigbeee to get the best possible experience → Zigbee network optimization: a how-to guide for avoiding radio frequency interference + adding Zigbee Router devices (repeaters/extenders) to get a stable Zigbee network mesh with best possible range and coverage by fully utilizing Zigbee mesh networking
When in doubt, just add more Thread router devices, i.e. the more mains-powered Thread devices the better, (at least until Home Assistant’s OpenThread Border Router add-on gets support for multiple Thread Border Router adapters as then another best practice will be to add more Thread Border Routers to the same Thread network).