The disadvantages of container pools come down to flexibility and customization. Shipping containers come in standard sizes, so the sizes and shapes are limited. They also have a very distinctive look, which may not suit the aesthetic of your backyard. 

Beyond that, while container pools are more affordable than in-ground pools, certain models can be more expensive. This includes the cost to heat your pool, since the metal walls have more heat transfer than other types of pools (which some brands circumvent with insulation).

Yes, it's possible to make an aboveground zero-edge pool. Note that it's most common to build an inground one, but, if you raise the deck and surrounding poolscape, you can install an aboveground version. Keep in mind, if you need to haul in dirt, it can significantly raise your land prep costs.

Finding a reputable inground pool installation company starts with an online search and assessing a company’s positive and negative reviews. You can also check the Better Business Bureau’s reports for companies you’re considering to see if they have numerous customer complaints for poor service. One of the best things you can do to find a good company is ask for references and then call those past customers to see how they felt during the installation process and how their pool has held up. Finally, you can get estimates from the remaining companies to compare.

You can place many materials under a pool to level it, including sand, concrete, solid foam, pavers, or finely crushed gravel. You can also use a tamper or roller to level ground without using a shovel to dig. No matter the material, make sure to level the ground with sand first for a smooth, even surface for the pool to sit on.