I guess, but try to be realistic about what you're recommending as an "at least" speed. I mean, I could say, for super premium best performance and to eliminate all bottlenecks it is best to have a RAID 10 drive array attached to the a Tablo which will at least have 450MBps read write throughout. But, would that be realistic?
More realistic would be: The max single stream bandwidth for a Tablo is 10Mbps (the 1080p or 720p @ 60fps setting). The Tablo can serve out video to six clients and record up to four streams. That's a possible ten streams. 10 X 10Mbps is 100Mbps max. 100Mbps is 12.5MBps. The maximum theoretical throughout of a Tablo is 1/5 of what you're recommending as a minimum throughout on a drive to eliminate bottlenecks.
For me a recommended "at least" speed is the minimum speed for a system to work properly, not the theoretical max of the bus that a drive is connected to. So, given the max bandwidth that could theoretically be used by a Tablo is 12.5MBps, yea 60MBps is nice, but definitely not what is needed to run the system without bottlenecking it.