the hardware RAIDs won’t help at all with rendering, but might make accessing video footage a bit faster and smoother. RAID is mainly concerned with either having large volumes for storage, fast throughput, and/or data backup and redundancy.
None of which will improve render times.
As far as GridIron, I’m no expert. I really don’t get it though… I want all my machine available for the task at hand. If I needed to work and render at the same time, I’d set up network rendering on another machine, but your mileage may vary.