Hello, what is your exact use case ? having several UWB transceivers connected to a single MCU could work for very specific use cases. For a ‘standard’ RTLS thing (several anchors reporting distance), you need to have anchors separated from several meters in order to cover high surface and increase the precision of the location.
For this kind of use case, and 3 transceivers connected to a single MCU, you will likely need to have SPI wires of several meters, I’m not so sure it would work from a HW point of view. SPI bus is not meant for long distance.