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I can't take credit for brainstorming this strategy. It surfaced after the release of the 7th edition Necron codex in the Necron Tactics thread. That thread has grown monstoruly large and finding this in it information can be difficult, so I created this thread here to make this easier to find, and link to.

You'll need 6 Canoptek Spyders and a unit of Scarabs

Deployment

Deploy the Spyders as close as possible to your deployment zone edge. Make sure to leave room for 1 scarab in the middle of the Spyders.

Move Spyders

Spyders move 6" ahead, bringing the distance between them and the enemy deployment zone down to 18"

Spawn Scarabs

Each Spyder can spawn a single scarab base within 6". So starting with the outermost Spyder spawn scarabs starting in unit coherency with the scarab that is on the deployment zone, then placing each additional scarab, maintaining 2" coherency, but closer to enemy.
Your last spawned Scarab should now be 12" away from the enemy deployment zone.

Move Scarabs

Scarabs, as beasts, have a 12" move. You can move them up to the edge of the enemy's deployment zone.

If there are units anywhere near the deployment zone's edge, you can charge them.
If they are cowering in the back half of their deployment zone, or using some sort of null deployment, you can run them into the enemy deployment zone to capture/contest objectives.

Additional Thoughts
In the pictures above, the scarabs were all concentrated on one side of the board, to make photography easier. Alternatively you could deploy the original squad of scarabs fanned out to the other side. After the scarabs move up there is a potential for a line of 14-15 40mm scarab bases across, with 2" coherency, about 54inches, in front of the enemy's deployment zone.

If you pair this tactic with a Canoptek Harvest formation, you can give the squad of scarabs reanimation protocols.