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Starting out,
1) I would go ahead and Force Stop the PS App, as well as uninstall it. (This is, of course, only if you have it installed before this.)
2) Download this APK
3) Open up File Manager of your choice, Copy/Move the .apk you just downloaded into the '/System/App/ ' Directory on your phone.
4) Change the Permission of that .apk to RW-R-R

5) Download this .dex and Move/Copy it to the '/Data/Dalvik-Cache ' Directory. Same as above you need to change permissions to RW-R-R.

6) Download these two xml files: one, two. Now, move/copy these two files to the '/System/etc/permissions/ ' Directory. Once again, change the permissions to... RW-R-R.

7) okay, now for the important files, .jar's, if you know java lol. File one, File Two

After you download those two files, once again, More copy/moving. Copy these two files to the '/System/Framework/ ' Directory. After they have been successfully copied them, change the permissions to RW-R-R.

8) Now, Reboot!

9) Go to play store download PS App.

10) Go back to the location where you downloaded the Remote Play .apk and click the .apk to install like normal. Now, the installation should finish. Great.

Update, if you moved the remote play .apk from step 3, then just go to the /System/app directory and click on the .apk file from there. You just need to open the Install prompt and install the app for the force close to dissipate.

11) go back into PS App, and under the 'Connect to PS4' you should now see a Remote Play button to the right.

12) Clicking it should open the Remote Play app, if you get the Error 8800.... whatever, Then you need to uninstall SuperSU or whatever the app is that controls your Root Permissions.

I know in SuperSU, I used the option, "Reinstall - Cleanup for reinstallation from Google Play" and then just never reinstalled, until I need root again.