they would prob do better in a mature tank but i have added them to my 1 week old tanks before in the past and they still do great. bubble tips are the more easier anemones to have 1
i'm not going to lie i float for 30 mins then through in the anemone this is just me and i do the same with coral once done dipping never have i lost a anemone due to the way i acclimate.
in the stores they just float then release.
your process will be fine the only thing is you need to know is that they can wonder for weeks before settling down and be careful they do not get into the pump. though it may survive if it does, i recommend you get some thing foam or something for your power head so the rbta does not get sucked in while roaming.