I understand that you want to know if the Slingbox will work on your country (which is not included on the list).
In this case, it does not really matter. You can install and use the Slingbox PRO-HD on your country. Since the Czech Republic uses a different TV Video format than U.S, I recommend you to check the right TV Video format for your country (PAL) and make sure to get it through the U.K. Online Store (or any available retailer store on your country).
Besides this, I also recommend you to check if your computer and local area network meet the requirements for the Slingbox PRO-HD. Just make sure to check the following links.