I don't own that particular router myself, and have only owned dual band routers not tri-band. But every dual band one I have owned allows discreet SSID's for each band. However, you do have the option for all the routers I've seen to disable bands if you like, and if you don't disable any bands, you also have the option to set the SSID's PW to be the same for each band.
If your end-use devices are set to auto-select their band, you probably have no need to worry if it has to switch, so long as you have previously trained the device to memorize the SSID and PW for each band. It will be relatively seamless to you as you use the device, although you might get a temporary warning that you are disconnected if it switches over.
I currently have two dual-band routers and two dual-band extenders all running simultaneously on my property. Each has a unique SSID and PW for each band, so total of 8, and I never have an issue (we will agree to knock on wood here). Actually it makes it easier to cope whenever one of them decides the IP is no longer good for one of my end-use devices being used.
🙂
Davemon50