Yes. BTCPayServer should be the best. The only thing is that you should be a programmer to integrate it. Or hire someone that create the integration for you.
Not necessarily. You can always use
third-party hosting services instead and that won't require any programming knowledge.
It should be as easy as using any third party plugins. I would trust BTC Pay Server over coinpayments and alike any day. I like the philosophy behind the project as it is very close to what Satoshi envisaged about transferring payments between senders/receivers directly without third parties taking commissions for facilitating something that should be free anyway.
Another option is for those using Wordpress/Woocommerce. With the fantastic plugin called "Nomiddleman" you can start accepting payments immediately without the need for servers and APIs and no need to use sign-up and register at any third party at all and you can start accepting any of the following currencies within seconds after you download. It is the easiest and most simple manner in which to accept mass payments using mass crypto options without paying third parties any commission.
I highly recommend it:
https://wordpress.org/plugins/nomiddleman-crypto-payments-for-woocommerce/Cardano (ADA)
Basic Attention Token (BAT)
Bitcoin Diamond (BCD)
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Bytecoin (BCN)
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Bitcoin SV (BSV)
Bitcoin (BTC)Bitcoin Gold (BTG)
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MyriadCoin (XMY)
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Zcash (ZEC)
https://nomiddlemancrypto.io/https://nomiddlemancrypto.io/getting-started/