Ok will try to explain a little ,
panels are not stored on websites they are hosted on hosting sites ,Hosting site can contain a website , think of hosting as a online filing cabinet where one drawer can hold a website or many websites and another draw holds apps for people to download and another draw holds panel files for apps to handshake with to allow access. this is a brief description but sort of explains it.
so you would be looking for someone to host your panel for you i suspect , some kind hearted sole may host it for you
Many people on here sell customised apps like smarters then host the panel files for the person who buys the APK , they actually host the files for you and give you access to the panel even allowing you to set your own username and password to access the panel , this is normally included in the price of the APK sale once setup the seller will have hardly anything to do with the panel again as its yours but on his hosting , however he is always there if you run into trouble and APK stops working for one reason or another he can check for you.
point to note Hosting is quite cheap so are apps
so depending on how many apps or panels you intend hosting will depend if you buy your own or buy a customised apk with panel access.