There are a few things that you can do in order to get your monitors mounted without them being ready to be mounted onto the stands.
The first option is to simply dismantle the monitors from their stands and then stain or paint the wooden pieces to match your desk. This will give you more surface area on your table, which will make it easier to manage your monitor settings.
Another option is to use an adjustable Height Stand that allows you to adjust the height of your monitors so that they are at a comfortable viewing angle. This can be a great option if you want to adjust the height of your monitors for different tasks, such as working on documents or browsing the web.