Hello...

@Nextasy... you have too many choices.

just keep your mind:
if you want to install more than one application, then they must all apks have the same signature...
if you respect this, never again you can see "app not installed"

see my phone android 10... all installed... all functionally...

Spoiler: img
[Only registered and activated users can see links. ]

all applications are redirected to see the same map folder.

has_secondary_root=1
android_secondary_root_path="/storage/44F8-1AF2/SharedMaps"

also with this function you can have a second map folder for tests... like 2019.Q4 and 2020.Q2 etc...

two points need to pay attention for for each APK, for more than one before installation...

1. the <Package Name> need to be unique.
2. the <Data folder> need to be unique.

else the one overwrite to the other...

you can use any of my mod, thats edited for unique <Data folder>.

as @Boki_srb said remove it and install that he mentioned...
but first think if you need and second app, because in this case you need to re-sign first the apk...

about the LUNA i have installed in Tablet 5.1.1

a good solution for anyone playing with apks
is to make their own signature files, who will first sign the apk before the installation...

Spoiler: Sign_Tool
https://alterupload.com/?sucgamcyx4djv3ajwj42