Scaled scrum Questions

Hello, I have below questions on Nexus guide.

1. If we need 100+ developer to work on a Product. Can it be done through scrum?

As per nexus guide: Nexus is a framework consisting of roles, events, artifacts, and techniques that bind and weave together the work of approximately three to nine Scrum Teams working on a single Product Backlog to build an Integrated Increment that meets a goal.

2. Is it recommended that all scrum teams working on the same product to have common “Sprint Length". Otherwise it may create problem for sync up.

3. Can I have some example on the “priority must be given to the work for the Nexus Integration Team Membership in the Nexus Integration Team takes precedence over individual Scrum Team membership."

As per nexus guide: Members of the Nexus Integration Team may also work on the Scrum Teams in that Nexus, as appropriate and necessary. If this is the case, priority must be given to the work for the Nexus Integration Team. Membership in the Nexus Integration Team takes precedence over individual Scrum Team membership. This preference helps ensure that the work to resolve issues that affect many teams has priority

Thanks,
Soumya