The top mounted-system and the side-mounted system is a choice you may have to make when you are installing a filter. Both systems run in the same way, but do have differences in the ease of installation and the installation cost. It will be up to you which system you decide to use.
A top-mounted system is a cheap option to install. The filter is easy to install in this way and the pipes are easy to install too. There are fewer parts needed, less time needed to install the system, and less labor needed to install the system. This means that overall, it will cost you less money to install a top-mounted system. However, it is harder to maintain a top-mounted pipe.
With a top-mounted system, you cannot reach the content inside without first removing the pipes on top. This makes them more difficult to maintain. Side-mounted systems cost more to install, but once the installation is complete, you can get into it without having to move any pipes.