big boy, cheap & full pu promote do not exist. There are 2 types of promote bumpers in the market out there nowadays, the original one uses fibre reinforced pu, while there are a few imitation promote bumpers (with some design flaws - mainly the sides do not match your fenders & no grill area) using 100% fibre.
promote bumpers are indeed very low, so the only way you can prevent it from hitting slopes of potholes is to get adjustable suspension and make sure there is enough clearance. Also when you go through speed bumps and slopes, go slowly and if your car is too low, u should drive through it sideways rather than head on.
rickmoh, quite a few ppl are not satisfied with daiichi's workmanship nowadays, so if u prefer I can just fabricate the bumper and you can ask your regular workshop to install it for you. It is very easy to install.