I'm not familiar with your model, so can't comment on what is standard fitting.
A floating caliper only has one piston. When this piston pushes the brake pad against the disc, its action moves the sliding part of the caliper so that the brake pad fixed to the caliper presses against the other side of the disk.
A fixed caliper has two pistons and each piston is responsible for pushing a brake pad against the disk.
When a floating caliper siezes, it is usually the sliding part of the caliper that stops sliding. You then only get the pad on the piston side pressing on the disk and you get vastly reduced braking effort. If the piston has siezed, you get no braking effort at all.
On a fixed caliper, if one piston siezes, you get reduced braking effort. It is very unlikely that both pistons would sieze at the same time. If neither piston moves, it is usually a problem elsewhere in the system.