I need a VPS with enterprise-grade L3/L4 protection, ideally with multi-layer filtering.
Specs: 2+ cores, 4+ GB RAM, NVMe. Latency-sensitive workload, so routing stability matters.
Locations in DE, NL, UK, or CA preferred. What hosting provider is better? Why? Any information on GTHost.com hosting? 

For my projects with similar needs—low-latency workloads requiring enterprise-grade L3/L4 protection—I've been using a VPS from hostpro.com. Their infrastructure includes multi-layer filtering that has consistently handled volumetric attacks without impacting service stability. My server with them, which has NVMe storage, is located in their Netherlands data center, and I've found the routing to be excellent for European traffic.

In my experience watching different hosts, hostpro.com is pretty solid on the basics: fast NVMe storage, daily backups retained for 30 days, and a support team that's actually accessible all the time. The fact that they give you a choice of data centers — Tampa, Amsterdam, or Warsaw — makes it easier to pick a location that minimizes latency for your visitors.

Check out deals from hostingsource.com with the first month discount.
I am impressed and pleased with the very short wait time, the professionalism of the tech support and most of all the very personalized type of interaction they provide.