If you have sufficient flow in your tank there's no reason to spot feed them imo.
If I was going to spot feed them i'd feed them Krill or Bryne Shrimp with a dripper, yes it's nice to see. I feel they will get all the nutrients hey need with proper flow and lighting and it's best not to stress them out or take that chance by spot feeding them. Just leave them alone and if your water conditions are good along with a good flow and lighting they will be fine. I've had my Plate coral for months now, it's short tentacle but is growing nicely.I also let it rest on the sand bed and I have a orange diamond goby and there's no problems. The PC hasn't moved at all really it seems really happy where it is.