Hi Christin,
Yes you can needle through the plantar aspect- it can be difficult in some patients so you can do cupping first to desensitize the plantar surface then target the area. I like to need from medial or lateral sides to get to the area as well. I would also focus on the tibial nerve as it comes through the tarsal tunnel if it is symptomatic. ENS is helpful in this region as well.
Hope that helps.
Frank
