I don't believe that you can split your strike point rolls up, but if you had a section of Tiamats each could fire at a different strike point. Unfortunately the Tiamat doesn't have an Advanced Targeting Computer rating so it can't benefit from the EST, but you can apply the Active Phased Array to your strike point roll I believe. If another unit in your section has a FCS (Fire Control Somethinganother) you could add another +1 to the roll. The cool thing is your Cougar doesn't have to be in your section to help with it's APA as APA is universal to all friendlies. So a Cougar in your Cataphract, Rhino, Sabertooth Attack Section could help out your Tiamat/Panther Section, while the Panther has a FCS to help as well. That means you'd need a seven on your strike point roll.
Tiamat's are a little substandard when compared to the Raijin, as the Raijin has FCS AND Chain-Fire Pod. Chain Fire Pod says that if you hit a strike point, you can pass that strike point on to friends. So if you need to rain down rockets on one model (or location that has several models) Chain Fire can really help. If Ritter had the Griffin model out, I'd for sure have two Griffin's, a Tiamat, and a Panther there to rumble. you'd have two FCS to help one of the Griffin's, an Advanced TC to help an EST or target lock, and Chainfire to pass to the other Griffin and/or Tiamat. So you'd need a seven with just this unit on your strike point roll. If you had a Cougar running around dropping APA, you'd need a five for your strike point roll! After that successful roll, the other units could skip the strike point roll all together and drop their rockets right on the strike point due to chain fire.
If you are playing with add-ons, you can tack on a FCS and a Chain Fire Pod which can help the Tiamats. They also have counter battery which can impact that game but I need to re-read the rules and the FAQ before I comment on it!