That 800 V ceiling puts it into the offline flyback, LED lighting, and auxiliary supply bracket — the kind of rail where you need margin above a 400 V DC bus without jumping to a bigger package. At 2.5 A the dissipation in the channel alone hits about 22 W before you add switching losses — the 60 W package limit at the case gives some headroom, but the real thermal limit depends on how much copper you put under the DPAK tab.
The ±30 V maximum gate-source rating gives plenty of margin for a 10 V or 12 V gate drive rail; just watch for ringing on long gate traces that could exceed that limit. The 5 V gate threshold at 100 µA is on the higher side, so a 5 V logic-level drive will not fully enhance it — plan for a 10 V gate drive to hit the rated Rds(on).