The solution can be implemented in-house.  

Ten to 40 people are involved in maintaining the solution because we have a good storage support team. These ten to 40 people are engineers, and developers are not involved in tool maintenance support of NetApp's or SnapMirror's functionality. We have a global IT support team formed mostly by engineers, not developers.

I've deployed it on-premises. I've configured it for two customers, and it's been working properly for them.

First, you need to open the required ports. Then, you can do cluster mirroring, and you can replicate at the volume level. The required port should be open for both NetApp storage systems. You need to follow the NetApp recommendations for opening ports. Then, you go through cluster pairing and installation and select the volume you want. 

One person can deploy it, but ideally, a team of two people is best for deployment and maintenance.

I'm an end user providing services as a consultant.

This really depends on the size and complexity of the implementation but typically it is either in-house completely or a combination of in-house and vendor support. I have never relied on just a vendor implementation. The primary vendor I use is very knowledgeable and responsive to my needs.

I have implemented this solution since i started my working with Netapp solutions

We had a local partner that helped us with the initial implementation.

We handled the implementation ourselves.

Obviously in-house.

We had a consultant assist us in the implementation of the solution.

Vendor Team - Yes Experience was good