I was up and running in about 5 minutes with Lemmy Easy Deploy. I can’t recommend it enough.
You should be able to set the swipe options for the default mail app in the Settings menu.
Awesome work! Added my instance!
It works well on my iPad, but I can't speak for Android tablets.
I definitely agree on Easy Deploy. Worked right away for my instance.
My personal (extremely small) instance with only a few users currently costs around $8 / month on a VPS. Still have plenty of headroom for more users as well I believe.