You can’t power the DWM1001 from 5 V as it requires a 3.3 V supply. Also, the DW1000 IC can be sensitive to power transients when entering transmit and receive modes, so you should select a DCDC with fast transient response. The part you’re using from MeanWell seems to be quite a heavy duty part, almost like an AC adapter and I’m not sure how suitable it is. But as it outputs 5 V, you’re going to need a regulator to take that down to 3.3 V anyway. You could use Torex XC9258B33, which we have validated for use with DWM1001. It’s listed on the DW1000 datasheet as a recommended part also.
For layout guidelines regarding EMI, it’s always important to follow the vendors specific guidelines. Usually you need to ensure power inductor and capacitor components are kept as close as possible to the regulator IC, use wide PCB traces, etc. to ensure current return loops are minimised.