I've kept bubble tips in a Shu for weeks without issue. My man-made clownfish don't know what a nem is and I left them and the nem together for weeks until I gave up.
Do not try to feed the nem anything until the mouth is properly sealed up. Gaping is there way of doing a water change and acclimation. Adding food means they have to expend energy to digest the food and they are better off getting settled in first.
If you have clownfish in the tank already, and if they know what a nem is then letting the nem go could be a boost for it IFF the clownfish move into it. Tending clownfish are better care takers than we are, ime.
If you don't have clownfish, dont complicate the situation by getting them in hopes of getting help. Counter intuitive but just my opinion that keeping things simple is the safest way to make progress, one change at a time.
Give it a day and see if it isn't sitting upright.
Also, to my eye that may not be a bubbletip,(?) and if it's something else it may want to be treated
@OrionN? has a method for "carpets" that aids with their survival.
Only mention the last part, just in case. I know traveling anemones can get pretty disfigured from the shipping stress. My Bubble tips often don't look very "bubbly" but my worry is more about the huge gapping mouth and that looks more like other nems, to my poor eyesight.