Begginers question (Arduino + APA102 + PC)

Hi. Im trying to build a Hyperion setup.
I have already got the following equipment:
* A x86 Windows HTPC running Kodi
* Arduino UNO v3
* Rasperry Pi3
* APA102 strip already placed behind the screen and with power connected.

What are next steps? Firstly, do i need to use a RPi3 at all? Can Hyperion be installed directly on HTPC and use the Kodi plugin to control the strip through Arduino?
Secondly, which pins on Arduino Uno i should use to connect LED strips and what firmware i should upload on Arduino

I mean i can use RPi3 if its better or more feasibile, i just thought that the Kodi plugin has already Hyperion built in and I wont need.

[edit] I have managed to get it working. Many thanks!
My only problem is that in Windows, the max baud rate i can select (in "Device Manager" -> USB Serial device (COM3) -> Properties) is 115200 and im not sure if its only me, but Hyperion feels little bit laggy.

Hi. I have adjusted baudrate to 1000000, unfortunately i am still feeling that there's a lag. Here's the video i made - ive got a feeling that the backlight has 1/4 second delay to the screen.

Nah, i changed both ino file and hyperion (otherwise it doesnt work at all), only left it as it was in Windows Device Manager, as this one cannot be changed to higher value. Maybe it will be better to create a new thread on software support forum

Many thanks! I have increased the screen graber resolution to 2.5 times number of leds and increased refresh rate to 30fps and now it works perfectly fine!