Maddison still has one more year left to go on his current contract. I don't know how eager he is to continue to play in the English Premier League now. But I believe he absolutely belongs with the league. The Championship is quite below his level and it wouldn't affect his career positively either.
If he insists on leaving then maybe Leicester can be okay to drop down by a little more in the asking price.
I have come across with this news now. It looks like the source I looked into first wasn't telling the truth. There is already an agreement for 40 million pounds and the deal is soon about to become official. This must be great news for Maddison and Tottenham both. Because Maddison won't have to compete in the Championship anymore.
For Tottenham it must be really nice to have an attacking midfielder. I mean he is going to be the only player whose main position is attacking midfield. Tottenham have been a team using various formations so I don't think Maddison would have any issue with having a place for himself in the lineup.
Besides he can play as a central midfielder and even on the left wing if there is need. Versatility is also a positive for both sides.