calci.js file is:

import { LightningElement  ,track} from 'lwc';
export default class Calculator extends LightningElement {}
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calci.html file is 
<template>
<ligtning-card title="Calci" icon-name="standard:formula">
<ligtning-layout multiple-rows>
<lightning-layout-item size="12"  padding="around-medium">
<lightning-input type="number" name="FirstNumber"></lightning-input>
</lightning-layout-item>
<lightning-layout-item size="12"  padding="around-medium">
    <lightning-input type="number" name="SecondNumber"> </lightning-input>
        </lightning-layout-item>
        <lightning-layout-item size="12" padding="around-medium"> 
<lightning-button-group>
<lightning-button label="Add" icon-name="utility:add" icon:position="right"></lightning-button> 
<lightning-button label="Subtract" icon-name="utlity:dash"  icon:position="right"></lightning-button>
<lightning-button label="Multiply" icon-name="utlity:close" icon:position="right"></lightning-button>
<lightning-button label="Divide" icon-name="utlity:magicwand" icon:position="right"></lightning-button>
</lightning-button-group>
</lightning-layout-item>
<lightning-layout-item size="12"  padding="around-medium">
    <lightning-formated-text value={}></lightning-formated-text>
</lightning-layout-item>
</ligtning-layout>
</ligtning-card>
</template>
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calci.js-meta.xml file is 
<?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata" fqn="calci">
    <apiVersion>48.0</apiVersion>
    <isExposed>true</isExposed>
    <description> Simple calculator app build with LWC</description>
    <targets>
    <target> lightning__AppPage  </target>
    <target> lightning__HomePage</target>
    <target> lightning_RecordPage</target>
    </targets>
</LightningComponentBundle>

I have a lightning app which has the remote site settings dynamic.
So, is it a good practice to use metadataService.class (http://technome2.blogspot.com/2017/05/creating-remote-site-settings.html) in post-installation script to add remote site settings for the org?