This page of the Watch Dogs Legion guide contains a map showing the locations of all technology points found in the Nine Elms area.
There are 8 Tech Points in this district. The majority of them are located in restricted areas, which means that getting them can be risky.
Solar Garden [1]
The top floor is devised like a circle. Fly into this area using a cargo drone. Then look for a grate that allow you to throw a Spiderbot into it. Keep in mind, however, that this area is protected by guards. You don't have to enter this area, you just have to be on a transport drone and use a spiderbot to get around. Once you find the grate, use the spiderbot to go forward and pick up the tech point.
US Embassy [2]
The technology point is located in a restricted area, you can get it quietly with a spider bot or use a transport drone, but you can be detected. Just go down to the lower level and pick up the tech point.
Nine Elms Walkaway [3]
The technology point is located in a restricted area, you can use the Albion employee or a builder outfit. In the middle of the bridge on the right side, there is a wooden, makeshift door with an X sign. Shoot the barrel found on your right - it will explode after a while. Now go inside and pick up the tech point.
Vauxhall Tower [4]
The tech point is behind a locked door. To unlock access to the door, you need to summon a transport drone, then fly low for the explosives to hook them to the drone, fly to the roof and drop them near the terminal.
It is worth to see where the terminal is located by hacking the door, the red line will show you the way. Then drop the explosives near where the red line ends. You'll destroy the terminal, and the door will open. Open it, go inside and pick up the tech point.
Albion Station Nine Elms [5]
The tech point is located on the top floor of the building. Call a transport drone, which are in abundance in this area, then drop the explosives at the X sign on the wooden door, then enter the room and pick up the tech point.
Parcel Fox Distribution Centre [6]
The tech point is located in a restricted area, it's best to use the spiderbot. Place it in the air duct, and use it to descend. The point is located under the grates, but you can raise it while being above it.
The Battersea [7]
The technology point is located in a restricted area. To get the point, you need to go down the level below, access to which is blocked. Use a jet ski to enter the area, or use a spider bot to get through the grate and unlock the door.
Nine Elms Docks [8]
This area is actively protected by guards, instead of entering this place with a character, use the spider-bot. There is a ventilation shaft near the tech point. Get in there with the spiderbot and keep going forward.
Coming out of the ventilation duct, jump on the pipes and go forward.
At the very end of the road there is a tech point, pick it up and quickly escape this place.