You can use an Eakin Seal with convexity. It really is personal preference/performance...there isn't a right or wrong
I use the Coloplast Assura Extended Wear with deep convexity and I am never without an Eakin Seal
I get anywhere from 3 to 7 days wear time. It really depends on how well I center the hole to my stoma, the heat and if I've done a lot of running.
Glad things are going well