Correct

上不封顶，下不保底

/ shàng bù fēngdǐng, xià bù bǎodǐ / 
Strokes

Example

As a Verb

impose ‘no ceiling or lower limit'; neither impose a ceiling nor fix a floor (on prices, bonuses, etc)

1
Duì
对
yuángōng
员工
de
的
jiǎngjīn
奖金
shàng
上
bù
不
fēngdǐng
封顶
  
,
xià
下
bù
不
bǎodǐ
保底

impose‘no ceiling or lower limit' for bonuses; neither impose a ceiling nor fix a floor on bonuses to the employees