I can tell you that is not how I have my RB260 set up. Frankly, I am a bit confused about what you are trying to accomplish. I am assuming that your SFP port (which you state is your uplink), is connected to a smart device. If that’s the case, why do you have any non-tagged traffic on that port. Are the devices on ports 1 - 5 smart (i.e. VLAN aware)?, and do they need to have more than one VLAN. Assuming that ports 1 - 5 are all “client” type devices, generally they are not VLAN aware, so I’m kind of wondering.
Give a little more info and I can better answer your questions.