I also watched them, Sir.
Spurs mostly play with the back four. Please check for details at Soccerway.com. I will give you just the summary.
Several occasions they played with the back 3, with Dier as CB (most of time he is the back up if one of Verthongen/Alderweid was absent), with Wanyama-Dembele as duo DM, while releasing 2 wings back to help the attack, with Ericcsen as the starting point of the attack.
Normal formation chart always puts Wanyama and Dier in a straight line (as duo DM), while in reality Dier will stand in the middle, to assist Erricson, while Wanyama protecting the back four.
For EPL only :
Spurs with Back 4 : 4-2-3-1
vs Hull (a), vs Leicester (a), vs United H), vs Westham (a), vs Arsenal (h), Watford (h), Bournemouth (h), Swansea (a), Burnley (a), Liverpool (a), Boro (a), Sunderland (a), Burnley (h), MU (a) - he did not play, Swansea (h), Chelsea (a), Westham (h), Arsenal (a), Leicester (h), WBA (a) - did not play, City (h) - did not play, Boro (a) - did not play, Sunderland (h), Stoke (a), Liverpool (h), Palace (h), Everton (a)
Back 3 : 3-4-2-1
Palace (a), Burnley (a), Souton (h), Everton (h), Stoke (h), City (a), WBA (h), Chelsea (h), Watforf (a), Souton (a), Hull (a), Arsenal (a)
cheers,