I am still a newbie myself (only two spawns under my belt).. So far i have used both Atison's Betta SPA and placed an almond leave in together (maybe a little over kill? maybe not? Maybe a more experience breeder can shed some light? ). Because i try to cycle my spawn tank before, my leave usually falls to the bottom of the tank.
1st spawn my HM male made the nest under the Styrofoam cup
2nd spawn (same male) started the nest under the Styrofoam cup then later extended and moved the nest outside of it (wasn't enough room for his nest) It was a really big bubble nest
Both my spawns, the male made the nest under the Styrofoam cup but that's because my leave is at the bottom of the tank
Not sure if i answer your question but thought i shared my experiences.