If you're in a position to follow the regular Instructions and dig a hole to fill with concrete, then an indoor hoop can be as simple as an outdoor installation. This is rarely the case indoors, where the earth beneath flooring can be a total unknown until the ground is broken. Giant hoops like the Mega Slam systems can't just be nailed down to the floor. You'll need to consult a qualified engineer to ensure your custom install plan will take the weight of the hoop plus the strain of play. You can see in the image of Paul Gudde's installation the use of a huge plate below the standard anchor plate. There is as they say, more than one way to skin a cat and the same is certainly true of indoor Mega Slam Hoop installations.