In Tanzania, the best area for paragliding is definitely Lushoto.
But, down in the south, Mbeya is also worth visiting.
The very best flying site is Mount Mbeya, shown here. It is a longer hike-and-fly trip, better to be started from Lunji Coffee Farm - lunjiestates.com. (All takeoff and flying directions possible.)
As an easier option, there is also a good takeoff quite in Mbeya city, 1 hour or a bit more of hike from the Catholic Cathedral, to the Cross on the hill and a bit beyond. (With SW-W winds.)
Landing can be well done in City Garden, plenty of space and well visible.
One more area is a bit NE of Mbeya, at Chunyua Road B345 Antennas or, a bit further. (With E-S winds.) Better go go there with mototaxi.
Mbeya Peak
-8.839547, 33.367858
Mbeya Cross Ridge
-8.868477, 33.432736
Antennas
-8.857584, 33.518263