Here's more about each of those 10 best high RTP slots along with information about where you can play them.

Mega Joker  99% RTP. ...
Codex of Fortune  98% RTP. ...
Starmania  97.87% RTP. ...
White Rabbit Megaways  97.72% RTP. ...
Medusa Megaways  97.63% RTP. ...
Secrets of Atlantis  97.07% RTP. ...
Steam Tower  97.04% RTP.

Highest RTP slots online

1
Monopoly Big Event  (99% RTP) ...
2
Mega Joker  (99% RTP) ...
3
Blood Suckers  (98% RTP) ...
4
Rainbow Riches  (98% RTP) ...
5
Double Diamond  (98% RTP) ...
6
Starmania  (97.87% RTP) ...
7
White Rabbit Megaways  (97.77% RTP) ...
8
Medusa Megaways  (97.63% RTP)