You can bolt in your on demand regulator to anywhere on the frame of your generator, as long as you don’t drill through any vital components. The most important and obvious component to avoid drilling through is the gasoline fuel tank. In general, you should place at least two bolts to secure your regulator. However, be wary of placing more, as this can make the exterior of your generator look like swiss cheese and allow water to seep inside if it’s outside in the rain.