Justin Bieber has a inground pool
They will most likely work, they just have to have the same specifications.
Ladder's are very important in a swimming pool. If you don't have a ladder, people can get hurt. If there is an emergency and someone needs help, it would take a while for the person to get help.
They don't make them for in ground.
Most pool lights are 12v ac and run off a transformer so no need to ground
Yes, but make sure the ground has settled.
One can get good inground swimming pool by acquiring good inground swimming pool kits. These kits are available online and simple internet search can give you contact details of manufacturer and supplier of good inground swimming pool kits.
air pocket behind pool liner inground
It depends on what type of pool kit you are referring to. If you are looking for inground pools, no. If you are looking for above ground pools, yes. They have an above ground pool for $349.
If it is an above ground yes
In simplest terms, an above ground pool pump is a flooded suction pump, which means the water level must be higher than the pump for it to operate, and an inground pump has the ability to draw water up from a level lower than the pump. The engineering and structure of these two different types of pumps is what makes them work the way they do. This means that, in a typical installation, you could use an inground-specific pump on an above ground pool, but not an above ground pump on an inground pool with the water level below the pump.
An in ground pool and an above ground pool have difference maintenance requirements. You should start by researching the time and effort it would take to maintain them. Then make your decision based on your research.