That's the exact predicament I find myself in, propman07. The support piece from the front plastic trim gets in the way of the fan if you try to line it in front of the drive case. I put a 80mm fan on the inside to the left of the drive case and that has helped bring down temperatures for one of my two SAS drives. (one idles at 40degrees while the other at 44, peaks are 43 & 48 respectively) Another thing this 80mm fan has helped to cool is my nvme m2 drive which now sits comfy at around 37-39). I'm going to try adding another 80mm fan to the front and try to align it so it doesn't block the support piece.
As for my other SAS drive on the top cage, I've no idea how to cool it as the T30 cannot accommodate a fan there. For anyone else who might stumble across this post while trying to cool their T30 drives, my advice would be to use SATA NAS drives in the T30 as they tend to run cooler than their SAS counterparts. I have a RED sitting in the top cage as well and the temperatures on that are great even during a parity check.
tl;dr: its hard to add fans to the T30, use SATA if you can.