When you schedule FP+ initially (options A, B, C, and Best Match), system does not take ADRs into consideration except warning you that your FP+ reservation overlaps with dining. So you can have FP+ ovelaping with dining or within 2 hours of ADR if you keep initial pics. If you want to change times after initial pics, the system will not give you options to reschedule FP+ until 2 hours after ADR time. You can get around that by scheduling ADRs after FP+ are made or by not having one person on ADR (you only need one name on ADRs, others can be just "guests"), scheduling FP+ for that person and copying it to everyone else.