I imagine ramp space at Renton will be getting tight with production continuing, but deliveries paused. Moses Lake would be a good ferry site.
Victorville is a great place to park them with the reasons in the article linked by willflyforcheese.
- It’s cheaper just to park the planes in Victorville than at airports
- It frees up space at airports that are otherwise congested
- When a fix for the 737 MAX is completed, it will be easier to do everything in one place, and then send the planes to the hubs they need to be at to get back into service
- Victorville has the right climate for storing planes