The budget could be the one main constraint; more are the remote offices, and much is the total cost. Also, it could be complicated to find the right building block that matches the requirements and the budget constraint.

However, there could also be some limitations in local IT facilities; space could be minimal, available electrical power could be capped, and UPS capacity limited.
Also, the lack of local IT support and people must be considered for both the deployment and the maintenance of the remote infrastructure.