You have already found that mp3tag can add multiple images to your audio files. This is true for almost all types - mp3, FLAC, m4a, etc. The player will determine if more than one image can be displayed and how it rotates through them. Refer to the documentation for your preferred player to see if it supports this.
You can start reading here in the documentation about the use of the cover window in the Tag Panel, including how to use the arrow buttons to nagivate between the different covers (and - for example - how to remove them):
That's no problem. You can even answer your own question.
And if you have found an answer by yourself, please don't delete your question, just add your own solution. Maybe future readers (including Google users) have the same question and can then directly read the answer/solution.