Note that while I rate Slot highly, I am apprehensive about him taking over at Spurs. He has been able to shape reasonable young players into a coherent system with a good shape at Feyenoord but the quality (and more so, experience levels of the quality players) in that league isn't particularly high, which makes it easier to do well by creating a high energy system where mistakes through pressing are more likely as well as having a higher chance of being rewarded. The quality and experience in the PL is vastly superior and many teams will be much better at playing through the press, with those that aren't adept at doing so fine to instead just play over the top of it (something that rarely happens in the Dutch League).
Additionally, we currently do not have a squad that suits his style of football. For him to have the remotest chance of success the recruitment department (still to be set up) will need to get Slot as a minimum.... A new keeper, 2 x new centre backs, at least one creative midfield player and likely a new left back as well. Perhaps even another player who can play from the wide left position. The manager will also likely need those players right at the start of the window as the way that he has his teams playing is chalk and cheese from the way that we have been playing for the last 4 years or so and will need a lot of coaching and is unlikely to start properly bearing fruit until the second half of the season even with a full pre-season to work in.
We also have a semi-toxic environment in the stadium at the moment with the home fans apathetic at best and apoplectic at worst, as well as our away fans chanting more and more loudly for the chairman to go at each away game. I don't think the new manager will get much in the way of understanding as he'll be seen by many as a Levy 'cheap' option (I'm not saying that is the way that I see him but with Poch going to Chelsea with us not wanting him and us also apparently not being interested in talking to Nagelsmann that will be a natural reaction from many in the stadium).
It is also likely that unless we sell Harry Kane we don't have much in the way of net budget to spend (no Europe and £80m already needing to be spent on Kulu and Porro) and if we do sell Kane then I'm not sure the £80 odd million of transfer funds he'd bring in would make up for the 15+ goals that we'd lose by having Richarlison up front instead of Kane.
With there likely being no European football we also may not have the luxury of games against far weaker and more forgiving opponents than those in the Premier League to allow the team to get used to the new style of football.
Finally we have a chairman who has repeatedly shown that he doesn't show managers any patience to allow them to go through a rebuild. If we're not in the top 7 after about 12 games then the axe is likely to fall and I think Slot is a manager who would likely need a decent amount of time (perhaps even 18 to 24 months) to build something decent at Spurs.