Found it!
Blocker-tower day6hard solution:
Place the first tower 1right 2down from the first enemy drone, and protect it with a hitter just next to it.
Place the second tower 2left 1up from the exit point, and protect it with the pointer placing it north of it.
Hope I was understandable.

It's on the third line of hard puzzles....

Shahar in my blocker 6 hard i see 2 blockers (towers?) 1 pointer and 1 hitter... I dont know the correct translation of bot names...

Blocker and smasher day6hard solutions??? :)

Shahar sorry maybe i was looking at the wrong puzzle! I also have problems with the translation because i play italian version!

Smacker day7hard solution:
Just place the 2 hitters in the bottom line

(Still stuck in wednesday hard drones!)

Blocker 7 hard solution:
Number the available positions with reading order (123 first line, 456 second line, 789 third line, 10 11 12bottom line)
Place hitters on postions 4,6,7,9
And place the blocker just under the position 7, just to make the drones use the same track.
It doesnt seem to work, but it works because the drones approach the hitters engage area in diagonal direction, allowing them to make an extra hit.
Not satisfied by hard puzzles since you have to make them choose a wrong track when they could work in a more effective way!