Mariano Jr. has signed for slot ($410,700).
Blake Perkins has signed for 800k, $93,100 under slot.
Running total: $478,700 under slot.
That's 7 of the top 10, and of the remaining 3, Stevenson was an over draft, so it's likely he signs for under slot, Wiseman looks like he'd sign for slot, and Glover is a senior sign. If Stevenson signs for 100-200k under slot and Glover accounts for another 120k, that could give the Nats $700,000-$800,000 to work with for rounds 11-40.